/* ==========================================
   CSS STYLES - KINGSTONVN ORDER ITEM MATERIALS DOCS v2
   Theme: Pencil / Slate Light UI (Sáng màu thanh lịch)
   ========================================== */

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;

  /* Color Palette - Sáng màu thanh lịch v2 */
  --paper-bg: #f8fafc;
  --paper-white: #ffffff;
  --pencil-color: #0f172a;
  --pencil-muted: #64748b;
  --pencil-light: #94a3b8;
  --border-color: #e2e8f0;
  
  --ink-blue: #2563eb;
  --ink-blue-bg: #eff6ff;
  --ink-green: #16a34a;
  --ink-green-bg: #f0fdf4;
  --ink-orange: #ea580c;
  --ink-orange-bg: #fff7ed;
  --ink-red: #dc2626;
  --ink-red-bg: #fef2f2;
  --ink-purple: #9333ea;
  --ink-purple-bg: #faf5ff;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-card: 3px 3px 0px var(--pencil-color);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--paper-bg);
  color: var(--pencil-color);
  line-height: 1.6;
  padding: 30px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 12px;
  padding: 24px 30px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-card);
}

.title-area h1 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--pencil-color);
  display: flex;
  align-items: center;
  gap: 12px;
}

.title-area p {
  font-size: 0.9rem;
  color: var(--pencil-muted);
  margin-top: 6px;
}

.btn-nav-group {
  display: flex;
  gap: 12px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--paper-white);
  color: var(--pencil-color);
  border: 2px solid var(--pencil-color);
  border-radius: 8px;
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 2px 2px 0px var(--pencil-color);
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--pencil-color);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--pencil-color);
}

.btn-blue {
  background: var(--ink-blue);
  color: var(--paper-white);
}

.btn-outline {
  background: var(--paper-white);
  color: var(--pencil-muted);
  border-color: var(--border-color);
  box-shadow: none;
}

.btn-outline:hover {
  border-color: var(--pencil-color);
  color: var(--pencil-color);
  box-shadow: 2px 2px 0px var(--pencil-color);
}

/* TABS SYSTEM */
.tabs {
  display: flex;
  gap: 8px;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 24px;
}

.tab-item {
  padding: 10px 20px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--pencil-muted);
  cursor: pointer;
  border: 2px solid transparent;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  margin-bottom: -2px;
  transition: all 0.2s ease;
}

.tab-item:hover {
  color: var(--pencil-color);
  background-color: rgba(226, 232, 240, 0.4);
}

.tab-item.active {
  color: var(--ink-blue);
  background-color: var(--paper-white);
  border-color: var(--pencil-color) var(--pencil-color) var(--paper-white) var(--pencil-color);
  box-shadow: 0px -2px 0px var(--ink-blue) inset;
}

/* CARDS Grid */
.cards-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  border-bottom: 2px dashed var(--border-color);
  padding-bottom: 12px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--pencil-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  border-radius: 4px;
  border: 1.5px solid var(--pencil-color);
}

.badge-blue {
  background: var(--ink-blue-bg);
  color: var(--ink-blue);
}

.badge-green {
  background: var(--ink-green-bg);
  color: var(--ink-green);
}

.badge-orange {
  background: var(--ink-orange-bg);
  color: var(--ink-orange);
}

.badge-purple {
  background: var(--ink-purple-bg);
  color: var(--ink-purple);
}

/* TABLES */
.table-container {
  overflow-x: auto;
  margin-top: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

th {
  background-color: var(--paper-bg);
  color: var(--pencil-muted);
  font-weight: 700;
  padding: 10px 12px;
  border-bottom: 2px solid var(--pencil-color);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--pencil-color);
}

tr:hover td {
  background-color: var(--paper-bg);
}

.text-right {
  text-align: right;
}

.font-mono {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* API DOCS ELEMENT */
.endpoint {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.method {
  padding: 3px 8px;
  border-radius: 4px;
  border: 1.5px solid var(--pencil-color);
  color: var(--paper-white);
  font-size: 0.72rem;
  font-weight: 800;
}

.method-get { background: var(--ink-green); }
.method-post { background: var(--ink-blue); }
.method-put { background: var(--ink-orange); }
.method-delete { background: var(--ink-red); }

pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 14px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  overflow-x: auto;
  border: 2px solid var(--pencil-color);
  box-shadow: 2px 2px 0px var(--pencil-color);
  margin-top: 10px;
  margin-bottom: 15px;
}

/* FLOW STEPS */
.flow-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 15px;
}

.flow-step {
  display: flex;
  gap: 16px;
  background: var(--paper-bg);
  border: 1.5px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  position: relative;
}

.flow-step:hover {
  border-color: var(--pencil-color);
  box-shadow: 2px 2px 0px var(--pencil-color);
}

.step-num {
  width: 28px;
  height: 28px;
  background: var(--pencil-color);
  color: var(--paper-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step-desc h4 {
  font-weight: 800;
  font-size: 0.92rem;
  margin-bottom: 4px;
}

.step-desc p {
  font-size: 0.85rem;
  color: var(--pencil-muted);
}